Title :
A CMOS linear-in-dB VGA based on exponential current generator
Author :
Kalenteridis, V. ; Vlassis, S. ; Siskos, S.
Author_Institution :
Phys. Dept., Aristotle Univ. of Thessaloniki, Thessaloniki, Greece
Abstract :
This paper proposes a simple CMOS exponential current circuit that is capable to control a Variable Gain Amplifier with a linear-in-dB manner. The proposed implementation is based on a Taylor´s series approximation of the exponential function. A simple VGA architecture has been designed in a CMOS 90nm technology, in order to validate the theoretical analysis. The approximation achieves a 17dB linear range with less than 0.5dB approximation error, while the overall power consumption is less than 300μW.
Keywords :
CMOS analogue integrated circuits; amplifiers; approximation theory; CMOS exponential current circuit; CMOS linear-in-dB variable gain amplifier; Taylor´s series approximation; exponential current generator; size 90 nm; variable gain amplifier control; Approximation methods; CMOS integrated circuits; Equations; Generators; Receivers; Transistors; Voltage control; Linear-in-dB VGA; exponential current generator;
Conference_Titel :
Design & Technology of Integrated Systems in Nanoscale Era (DTIS), 2011 6th International Conference on
Conference_Location :
Athens
Print_ISBN :
978-1-61284-899-0
DOI :
10.1109/DTIS.2011.5941429
